This standard gives the terminology, defines each term, specifies the method of designation and sets the dimensions and tolerances specific to this type of thread. The thread described below is used for threaded tubes and their fittings as well as for valve accessories and for all fittings that must be assembled on threaded tubes. Sealing is obtained by matting the external and internal threads during tightening; if this is deemed necessary, a suitable material can be interposed in the threaded joint to ensure the tightness of the assembly. The pipe thread for connection without sealing in the thread is subject to the NBN standard —
NBN E 03-101-1986 history
1986NBN E 03-101-1986 Thread processing, pipe threads, used for thread sealing interfaces. Terms, names, dimensions and tolerances